What it is
Diazolidinyl Urea is a white powder.
What it does
Diazolidinyl Urea is a preservative that prevents bacterial growth. It works by releasing small amounts of formaldehyde, a toxic and carcinogenic substance used to embalm dead bodies.
The Cosmetic Ingredient Review (CIR) Expert Panel considers Diazolidinyl Urea safe to be used in cosmetics up to a maximum concentration of 0.5%. In Europe, when the concentration of formaldehyde in the finished product exceeds 0.05%, the labels has to state “contains formaldehyde”.
Diazolidinyl Urea can cause irritations and allergies.